setjmp/tst-setjmp-fp.c

   1 /* Test that setjmp/longjmp do not save and restore floating-point
   2    exceptions and rounding modes.
   3    Copyright (C) 2013-2019 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <fenv.h>
  21 #include <setjmp.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24
  25 static jmp_buf __attribute__ ((unused)) env;
  26 static int result = 0;
  27
  28 #if defined FE_TONEAREST && defined FE_TOWARDZERO
  29 static int expected_rounding_mode = FE_TONEAREST;
  30
  31 static void
  32 change_rounding_mode (void)
  33 {
  34   if (fesetround (FE_TOWARDZERO) == 0)
  35     expected_rounding_mode = FE_TOWARDZERO;
  36   else
  37     puts ("fesetround (FE_TOWARDZERO) failed, continuing test");
  38   longjmp (env, 1);
  39 }
  40 #endif
  41
  42 #ifdef FE_INVALID
  43 static int expected_exceptions = 0;
  44
  45 static void
  46 raise_exception (void)
  47 {
  48   if (feraiseexcept (FE_INVALID) == 0)
  49     expected_exceptions = FE_INVALID;
  50   else
  51     puts ("feraiseexcept (FE_INVALID) failed, continuing test");
  52   longjmp (env, 1);
  53 }
  54 #endif
  55
  56 static int
  57 do_test (void)
  58 {
  59 #if defined FE_TONEAREST && defined FE_TOWARDZERO
  60   if (fesetround (FE_TONEAREST) == 0)
  61     {
  62       if (setjmp (env) == 0)
  63         change_rounding_mode ();
  64       else
  65         {
  66           if (fegetround () == expected_rounding_mode)
  67             puts ("PASS: longjmp preserved rounding mode");
  68           else
  69             {
  70               puts ("FAIL: longjmp changed rounding mode");
  71               result = 1;
  72             }
  73         }
  74     }
  75   else
  76     puts ("fesetround (FE_TONEAREST) failed, not testing rounding modes");
  77 #else
  78   puts ("rounding mode test not supported");
  79 #endif
  80 #ifdef FE_INVALID
  81   if (feclearexcept (FE_ALL_EXCEPT) == 0)
  82     {
  83       if (setjmp (env) == 0)
  84         raise_exception ();
  85       else
  86         {
  87           if (fetestexcept (FE_INVALID) == expected_exceptions)
  88             puts ("PASS: longjmp preserved exceptions");
  89           else
  90             {
  91               puts ("FAIL: longjmp changed exceptions");
  92               result = 1;
  93             }
  94         }
  95     }
  96   else
  97     puts ("feclearexcept (FE_ALL_EXCEPT) failed, not testing exceptions");
  98 #else
  99   puts ("exception test not supported");
 100 #endif
 101   return result;
 102 }
 103
 104 #define TEST_FUNCTION do_test ()
 105 #include "../test-skeleton.c"